正八边形多胞薄壁管吸能特性仿真和优化

基于正八边形多胞薄壁管相比其他截面形状薄壁管具有结构紧凑、比吸能高等特点,采用有限元软件Abaqus研究了其在准静态轴向压缩下的吸能特性,分析了不同截面形状和结构参数对吸能特性的影响.根据吸能特性指标,运用非支配遗传算法对正八边形多胞管边对边(S2S)结构进行了优化.结果表明,正八边形多胞管的边对边布置形式的吸能效果优于角对角布置形式,其S2S结构吸能特性最优.结构参数对其吸能特性影响明显,经优化后的S2S结构比吸能提高了33.11%,最大压溃力降低了3.78%,具有较好的吸能特性.

Simulation and Optimization of Octagon Multi-cell Thin-walled Tubes for Energy Absorption Characteristics

Compared with other cross section shapes of thin-walled tubes, octagon multi-cell thin-walled tubes have the characteristics of compact structure and high specific energy absorption. The energy absorption characteristics of octagon multi-cell thin-walled tubes under quasi-static axial loading were simulated with finite element software Abaqus. The effects of the cross sections shape and structural parameters on energy absorption characteristics of the multi-cell tubes were analyzed. According to the indicator of the energy absorption characteristics, a side to side distribution of the octagon multi-cell tubes (S2S) was optimized by using the non-dominated sorting genetic algorithm. The results show that the energy absorption characteristics of the side to side distribution is better than the corner to corner distribution, and the octagon multi-cell S2S tubes is optimal; and structural parameters significantly influence its energy absorption characteristics; the octagon multi-cell S2S tubes optimized has better energy absorption characteristics, the specific energy absorption is increased by 33.11%, and the peak crushing force is reduced by 3.78%.